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• • i <br /> TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(gg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date feet feel feet feet Benzene Toluene benzene Xylenes. TPH-g MTBE <br /> IP3B 10/13/05 822 -- -- -- 2,800 24,000 2,700 15,000 71,000 h <2,500/<100* <br /> IP3B o 10/13/05 8 22 -- -- -- 3,300* 27,000* 2,800* 15,000* 70,000 h <br /> IP3B 12/21/05 822 — -- -- 2,100 17,000 2,000 12,000 64,000 h <2,500 <br /> a Water in well may be residual water in end cap <br /> b Unidentified hydrocarbons present <br /> c Hydrocarbons ranging from C6-C 12 identified on the gasoline sample chromatogram <br /> d Analytical results maybe incorrect due to possible mislabeling of samples for UVB-MW 1 and UVB-MW2 Resampled on 2 October 1997 <br /> e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample chromatogram <br /> f Analyzed outside of hold time <br /> g Grab groundwater sample collected from well <br /> h TPH-g results beginning March 2002 include MTBE <br /> i Water sample taken from SW2 on 17 February 1994 was labeled as AS2 on chain of custody and laboratory results <br /> J Analyzed by EPA Method 8260 for ethanol The results are ND<I00µg/L <br /> k Analyzed by EPA Method 8260 for ethanol The results are ND<5,000µgIL <br /> I Analyzed by EPA Method 8260 for ethanol The results are ND<1,000 pg/L <br /> in Analyzed by EPA Method 8260 for ethanol The results are ND<50,000µg/L <br /> n Analyzed by EPA Method 8260 for ethanol The results are ND<500µg/L <br /> o Analyzed by EPA Method 8260 for ethanol The results are ND<20,000 µg/L <br /> p Analyzed by EPA Method 8260 for ethanol The results are ND<2,000µg/L <br /> q Tert-amyl methyl ether,tert-butyl alcohol,di-isopropyl ether, 1,2-dibromoethane, 1,2-dichloroethane,and ethyl tert-butyl ether <br /> not detected above laboratory reporting limits unless otherwise individually noted <br /> r Teri-amyl methyl ether detected at a concentration of 0 63 lig/L <br /> LPH Liquid-phase hydrocarbons <br /> TPH-g Total Petroleum Hydrocarbons as gasoline <br /> MTBE Methyl tertiary butyl ether <br /> * Analyzed by EPA Method 8260 <br /> -- Not measured,not sampled,or not analyzed <br /> n/L Micrograms per liter <br /> Note Groundwater elevations adjusted for LPH,when present,using an average specific gravity of 0 75 for gasoline <br /> Data from 1/87 from HLA <br /> g Iproiects1739425masterlwp1g1205\3942gw As <br /> Page 59 of 59 <br />